your crank case does not take oil at all. your transmission however will take usually 1 to 1.5 quarts of approved transmission oil.
1 quart
None
There is no oil in the crank case,,you use mixed gas and oil that's what lubes the crank bearings and piston rings.
It says the oil cap. On the crank case cover. I have the same bike, but I can't remember off hand the exact amount. I believe it is measures in ml on the crank case.
5 quarts total 4 in the crank case and one in the oil filter.
5 QTS. with new filter.
What oil
It sounds like there is too much pressure in the crank case, causing oil fumes to be cycled through the breather. High pressure in the crank case is caused by worn cylinder bores, allowing 'blow by'.
1100 ml =1.1L = around 1.2 quarts of oil its written on the crank case.
PW 80 is a 2 stroke. It does not have oil in the crank case. I think you mean transmission oil. I use 10w40 engine oil in mine and it works great.
That depends on your moped. Most mopeds madein the 80's are two stroke engines. Which do not use oil in the crank case. the oil is mixed in with the fuel.